Cant speak really for ALL 3rd Party inks but I am printing with an Epson Pro 4000 unit since 2 years and I am also print poster adds for customers. One of the "menu" print I did is now 2 years old and bright and shining its been printed with OEM K2 Epson ink sets.

After the first batch of OEM Cartriges went out I instaltly switch to refillable cartriges and Octopus OCP Inks. I have a two year old print of me and my financee and its maches exactly the screens colors